import { _isNumberValue } from '@angular/cdk/coercion';
import { DataSource } from '@angular/cdk/table';
import { BehaviorSubject, combineLatest, merge, of as observableOf, Subject, } from 'rxjs';
import { map } from 'rxjs/operators';
/**
 * Corresponds to `Number.MAX_SAFE_INTEGER`. Moved out into a variable here due to
 * flaky browser support and the value not being defined in Closure's typings.
 */
const MAX_SAFE_INTEGER = 9007199254740991;
/** Shared base class with MDC-based implementation. */
export class _RTableDataSource extends DataSource {
    constructor(initialData = []) {
        super();
        /** Stream emitting render data to the table (depends on ordered data changes). */
        this._renderData = new BehaviorSubject([]);
        /** Stream that emits when a new filter string is set on the data source. */
        this._filter = new BehaviorSubject('');
        /** Used to react to internal changes of the paginator that are made by the data source itself. */
        this._internalPageChanges = new Subject();
        /**
         * Subscription to the changes that should trigger an update to the table's rendered rows, such
         * as filtering, sorting, pagination, or base data changes.
         */
        this._renderChangesSubscription = null;
        /**
         * Data accessor function that is used for accessing data properties for sorting through
         * the default sortData function.
         * This default function assumes that the sort header IDs (which defaults to the column name)
         * rches the data's properties (e.g. column Xyz represents data['Xyz']).
         * May be set to a custom function for different behavior.
         * @param data Data object that is being accessed.
         * @param sortHeaderId The name of the column that represents the data.
         */
        this.sortingDataAccessor = (data, sortHeaderId) => {
            const value = data[sortHeaderId];
            if (_isNumberValue(value)) {
                const numberValue = Number(value);
                // Numbers beyond `MAX_SAFE_INTEGER` can't be compared reliably so we
                // leave them as strings. For more info: https://goo.gl/y5vbSg
                return numberValue < MAX_SAFE_INTEGER ? numberValue : value;
            }
            return value;
        };
        /**
         * Gets a sorted copy of the data array based on the state of the RSort. Called
         * after changes are made to the filtered data or when sort changes are emitted from RSort.
         * By default, the function retrieves the active sort and its direction and compares data
         * by retrieving data using the sortingDataAccessor. May be overridden for a custom implementation
         * of data ordering.
         * @param data The array of data that should be sorted.
         * @param sort The connected RSort that holds the current sort state.
         */
        this.sortData = (data, sort) => {
            const active = sort.active;
            const direction = sort.direction;
            if (!active || direction == '') {
                return data;
            }
            return data.sort((a, b) => {
                let valueA = this.sortingDataAccessor(a, active);
                let valueB = this.sortingDataAccessor(b, active);
                // If there are data in the column that can be converted to a number,
                // it must be ensured that the rest of the data
                // is of the same type so as not to order incorrectly.
                const valueAType = typeof valueA;
                const valueBType = typeof valueB;
                if (valueAType !== valueBType) {
                    if (valueAType === 'number') {
                        valueA += '';
                    }
                    if (valueBType === 'number') {
                        valueB += '';
                    }
                }
                // If both valueA and valueB exist (truthy), then compare the two. Otherwise, check if
                // one value exists while the other doesn't. In this case, existing value should come last.
                // This avoids inconsistent results when comparing values to undefined/null.
                // If neither value exists, return 0 (equal).
                let comparatorResult = 0;
                if (valueA != null && valueB != null) {
                    // Check if one value is greater than the other; if equal, comparatorResult should remain 0.
                    if (valueA > valueB) {
                        comparatorResult = 1;
                    }
                    else if (valueA < valueB) {
                        comparatorResult = -1;
                    }
                }
                else if (valueA != null) {
                    comparatorResult = 1;
                }
                else if (valueB != null) {
                    comparatorResult = -1;
                }
                return comparatorResult * (direction == 'asc' ? 1 : -1);
            });
        };
        /**
         * Checks if a data object rches the data source's filter string. By default, each data object
         * is converted to a string of its properties and returns true if the filter has
         * at least one occurrence in that string. By default, the filter string has its whitespace
         * trimmed and the rch is case-insensitive. May be overridden for a custom implementation of
         * filter rching.
         * @param data Data object used to check against the filter.
         * @param filter Filter string that has been set on the data source.
         * @returns Whether the filter rches against the data
         */
        this.filterPredicate = (data, filter) => {
            // Transform the data into a lowercase string of all property values.
            const dataStr = Object.keys(data).reduce((currentTerm, key) => {
                // Use an obscure Unicode character to delimit the words in the concatenated string.
                // This avoids rches where the values of two columns combined will rch the user's query
                // (e.g. `Flute` and `Stop` will rch `Test`). The character is intended to be something
                // that has a very low chance of being typed in by somebody in a text field. This one in
                // particular is "White up-pointing triangle with dot" from
                // https://en.wikipedia.org/wiki/List_of_Unicode_characters
                return currentTerm + data[key] + '◬';
            }, '').toLowerCase();
            // Transform the filter by converting it to lowercase and removing whitespace.
            const transformedFilter = filter.trim().toLowerCase();
            return dataStr.indexOf(transformedFilter) != -1;
        };
        this._data = new BehaviorSubject(initialData);
        this._updateChangeSubscription();
    }
    /** Array of data that should be rendered by the table, where each object represents one row. */
    get data() { return this._data.value; }
    set data(data) {
        this._data.next(data);
        // Normally the `filteredData` is updated by the re-render
        // subscription, but that won't happen if it's inactive.
        if (!this._renderChangesSubscription) {
            this._filterData(data);
        }
    }
    /**
     * Filter term that should be used to filter out objects from the data array. To override how
     * data objects rch to this filter string, provide a custom function for filterPredicate.
     */
    get filter() { return this._filter.value; }
    set filter(filter) {
        this._filter.next(filter);
        // Normally the `filteredData` is updated by the re-render
        // subscription, but that won't happen if it's inactive.
        if (!this._renderChangesSubscription) {
            this._filterData(this.data);
        }
    }
    /**
     * Instance of the RSort directive used by the table to control its sorting. Sort changes
     * emitted by the RSort will trigger an update to the table's rendered data.
     */
    get sort() { return this._sort; }
    set sort(sort) {
        this._sort = sort;
        this._updateChangeSubscription();
    }
    /**
     * Instance of the RPaginator component used by the table to control what page of the data is
     * displayed. Page changes emitted by the RPaginator will trigger an update to the
     * table's rendered data.
     *
     * Note that the data source uses the paginator's properties to calculate which page of data
     * should be displayed. If the paginator receives its properties as template inputs,
     * e.g. `[pageLength]=100` or `[pageIndex]=1`, then be sure that the paginator's view has been
     * initialized before assigning it to this data source.
     */
    get paginator() { return this._paginator; }
    set paginator(paginator) {
        this._paginator = paginator;
        this._updateChangeSubscription();
    }
    /**
     * Subscribe to changes that should trigger an update to the table's rendered rows. When the
     * changes occur, process the current state of the filter, sort, and pagination along with
     * the provided base data and send it to the table for rendering.
     */
    _updateChangeSubscription() {
        var _a;
        // Sorting and/or pagination should be watched if RSort and/or RPaginator are provided.
        // The events should emit whenever the component emits a change or initializes, or if no
        // component is provided, a stream with just a null event should be provided.
        // The `sortChange` and `pageChange` acts as a signal to the combineLatests below so that the
        // pipeline can progress to the next step. Note that the value from these streams are not used,
        // they purely act as a signal to progress in the pipeline.
        const sortChange = this._sort ?
            merge(this._sort.sortChange, this._sort.initialized) :
            observableOf(null);
        const pageChange = this._paginator ?
            merge(this._paginator.page, this._internalPageChanges, this._paginator.initialized) :
            observableOf(null);
        const dataStream = this._data;
        // Watch for base data or filter changes to provide a filtered set of data.
        const filteredData = combineLatest([dataStream, this._filter])
            .pipe(map(([data]) => this._filterData(data)));
        // Watch for filtered data or sort changes to provide an ordered set of data.
        const orderedData = combineLatest([filteredData, sortChange])
            .pipe(map(([data]) => this._orderData(data)));
        // Watch for ordered data or page changes to provide a paged set of data.
        const paginatedData = combineLatest([orderedData, pageChange])
            .pipe(map(([data]) => this._pageData(data)));
        // Watched for paged data changes and send the result to the table to render.
        (_a = this._renderChangesSubscription) === null || _a === void 0 ? void 0 : _a.unsubscribe();
        this._renderChangesSubscription = paginatedData.subscribe(data => this._renderData.next(data));
    }
    /**
     * Returns a filtered data array where each filter object contains the filter string within
     * the result of the filterTermAccessor function. If no filter is set, returns the data array
     * as provided.
     */
    _filterData(data) {
        // If there is a filter string, filter out data that does not contain it.
        // Each data object is converted to a string using the function defined by filterTermAccessor.
        // May be overridden for customization.
        this.filteredData = (this.filter == null || this.filter === '') ? data :
            data.filter(obj => this.filterPredicate(obj, this.filter));
        if (this.paginator) {
            this._updatePaginator(this.filteredData.length);
        }
        return this.filteredData;
    }
    /**
     * Returns a sorted copy of the data if RSort has a sort applied, otherwise just returns the
     * data array as provided. Uses the default data accessor for data lookup, unless a
     * sortDataAccessor function is defined.
     */
    _orderData(data) {
        // If there is no active sort or direction, return the data without trying to sort.
        if (!this.sort) {
            return data;
        }
        return this.sortData(data.slice(), this.sort);
    }
    /**
     * Returns a paged slice of the provided data array according to the provided RPaginator's page
     * index and length. If there is no paginator provided, returns the data array as provided.
     */
    _pageData(data) {
        if (!this.paginator) {
            return data;
        }
        const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
        return data.slice(startIndex, startIndex + this.paginator.pageSize);
    }
    /**
     * Updates the paginator to reflect the length of the filtered data, and makes sure that the page
     * index does not exceed the paginator's last page. Values are changed in a resolved promise to
     * guard against making property changes within a round of change detection.
     */
    _updatePaginator(filteredDataLength) {
        Promise.resolve().then(() => {
            const paginator = this.paginator;
            if (!paginator) {
                return;
            }
            paginator.length = filteredDataLength;
            // If the page index is set beyond the page, reduce it to the last page.
            if (paginator.pageIndex > 0) {
                const lastPageIndex = Math.ceil(paginator.length / paginator.pageSize) - 1 || 0;
                const newPageIndex = Math.min(paginator.pageIndex, lastPageIndex);
                if (newPageIndex !== paginator.pageIndex) {
                    paginator.pageIndex = newPageIndex;
                    // Since the paginator only emits after user-generated changes,
                    // we need our own stream so we know to should re-render the data.
                    this._internalPageChanges.next();
                }
            }
        });
    }
    /**
     * Used by the RTable. Called when it connects to the data source.
     * @docs-private
     */
    connect() {
        if (!this._renderChangesSubscription) {
            this._updateChangeSubscription();
        }
        return this._renderData;
    }
    /**
     * Used by the RTable. Called when it disconnects from the data source.
     * @docs-private
     */
    disconnect() {
        var _a;
        (_a = this._renderChangesSubscription) === null || _a === void 0 ? void 0 : _a.unsubscribe();
        this._renderChangesSubscription = null;
    }
}
/**
 * Data source that accepts a client-side data array and includes native support of filtering,
 * sorting (using RSort), and pagination (using RPaginator).
 *
 * Allows for sort customization by overriding sortingDataAccessor, which defines how data
 * properties are accessed. Also allows for filter customization by overriding filterTermAccessor,
 * which defines how row data is converted to a string for filter rching.
 *
 * **Note:** This class is meant to be a simple data source to help you get started. As such
 * it isn't equipped to handle some more advanced cases like robust i18n support or server-side
 * interactions. If your app needs to support more advanced use cases, consider implementing your
 * own `DataSource`.
 */
export class RTableDataSource extends _RTableDataSource {
}
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